Thank you ladies for all of the suggestions!! Even though we LIKED the name Piper, it was hard to say over and over again, and our 2 year old couldn't pronounce it.
Soo.. we picked the name Macie for her. A friend of mine actually suggested it, and 1) I think it suits her, and 2) our daughter can actually say it.
Even though I thought we were kinda nuts for getting her when we have a toddler and 3 month old, I'm VERY happy that we did. She's a great dog! And she and our DD are new BFFs.

Re: f/u: What would YOU name this dog? PIP
She's cute! She looks a little like my "Sally"